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From: Eli Zaretskii <eliz@gnu.org>
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Subject: bug#16901: 24.3.50; emacs_backtrace.txt
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> From: Juanma Barranquero <lekktu@gmail.com>
> Date: Sat, 1 Mar 2014 11:46:30 +0100
> Cc: Dmitry Antipov <dmantipov@yandex.ru>, 16901@debbugs.gnu.org, 
> 	Emacs developers <emacs-devel@gnu.org>
> 
> Just by adding -DGC_MCHECK=1 to CPPFLAGS and reconfiguring/recompiling
> I'm getting a lot of these:
> 
> mcheck: memory clobbered before allocated block
> 
> Where do I go from here?

These are most probably bugs.  Put a breakpoint where that message is
displayed, and post backtraces if you cannot figure out what is the
problem that triggers them.